html,
body {
  height: 100%;
}
body {
  display: -webkit-box;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
          flex-direction: column;
  background-image: url(../imgs/chenshi.png);
  background-repeat: no-repeat;
  background-size: 100% 100%;
}
.header {
  display: -webkit-box;
  display: flex;
  height: 1.33333333rem;
  line-height: 1.33333333rem;
  color: #0079ff;
  text-align: center;
  background: #ffffff;
  border-bottom: #b2b2b2 2px solid;
}
.header .left {
  width: 20%;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
          align-items: center;
  -webkit-box-pack: center;
          justify-content: center;
  font-size: 0.42666667rem;
}
.header .left img {
  opacity: 0.8;
  padding-right: 0.13333333rem;
}
.header .center {
  -webkit-box-flex: 1;
          flex: 1;
  font-size: 0.56rem;
  color: #000000;
}
.header .right {
  width: 20%;
}
.sec {
  -webkit-box-flex: 1;
          flex: 1;
  overflow: auto;
  background: rgba(0, 0, 0, 0.3);
}
.sec .dd {
  color: white;
  font-size: 0.4rem;
  line-height: 1.33333333rem;
}
.sec .dd .sheng {
  padding: 0 5%;
  border-bottom: 1px #ffffff solid;
  background: url("../imgs/chengshi2.png") no-repeat right center;
  background-origin: content-box;
  transition-property: font-size, color;
  transition-duration: .5s;
}
.sec .dd .sheng.da {
  font-size: 1.2em;
}
.sec .dd .shi {
  display: none;
  background: rgba(255, 255, 255, 0.2);
}
.sec .dd .shi li {
  border-bottom: 1px #ffffff solid;
  padding-left: 5%;
  text-indent: 2em;
}
.btn {
  height: 1.06666667rem;
  line-height: 1.06666667rem;
  text-align: center;
  background: #cccccc;
  color: white;
  opacity: 0.8;
}
